Alert archive / South Carolina / Mesoscale Discussions in 2004

Mesoscale Discussion 2271

September 27, 200419 counties in North Carolina; 22 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Sep 27, 2004, 6:31 PM EDT for 19 counties in North Carolina; 22 counties in South Carolina. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
Sep 27, 2004, 6:31 PM EDT (22:31 UTC)
Expired
Sep 27, 2004, 8:30 PM EDT
In force
119 min
Issued by
the Storm Prediction Center
All 41 counties

Anson County, NC, Bladen County, NC, Columbus County, NC, Cumberland County, NC, Duplin County, NC, Harnett County, NC, Hoke County, NC, Johnston County, NC, Lee County, NC, Montgomery County, NC, Moore County, NC, Pender County, NC, Richmond County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Stanly County, NC, Union County, NC, Wayne County, NC, Berkeley County, SC, Calhoun County, SC, Chester County, SC, Chesterfield County, SC, Clarendon County, SC, Darlington County, SC, Dillon County, SC, Dorchester County, SC, Fairfield County, SC, Florence County, SC, Horry County, SC, Kershaw County, SC, Lancaster County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Marlboro County, SC, Newberry County, SC, Orangeburg County, SC, Richland County, SC, Sumter County, SC, Williamsburg County, SC

The radar

The Wilmington radar (KLTX), 94 km from the middle of the area, began a volume at 22:31 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 10.5 hours before the alert went out and 167 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Charleston AFB, SC at 12:00Z on 2004-09-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1064 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Charleston AFB, SC at 12:00Z on 2004-09-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 124 square meters per square second.193958Sfc1 km3 km6 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1064 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
509 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
124 m²/s²
0-3 km storm-relative helicity
137 m²/s²
Significant tornado parameter
0.5
Supercell composite
2.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 27, 3:24 PM EDTMesoscale DiscussionSPCAnson, Bladen, Brunswick, Columbus, Cumberland, Duplin and 9 more96 min
Sep 27, 3:50 PM EDTTornado WatchSPCBladen, Brunswick, Columbus, Cumberland, Duplin, Harnett and 13 more6 hr
Sep 27, 6:05 PM EDTMesoscale DiscussionSPCAlexander, Avery, Buncombe, Burke, Caldwell, Catawba and 11 more115 min
Sep 26, 9:53 PM EDTMesoscale DiscussionSPCBeaufort, Berkeley, Charleston, Colleton, Dorchester, Hampton and 1 more2 hr
Sep 27, 12:35 AM EDTTornado WatchSPCAllendale, Bamberg, Barnwell, Beaufort, Berkeley, Charleston and 4 more8 hr
Sep 27, 4:47 AM EDTMesoscale DiscussionSPCBeaufort, Jasper118 min
Sep 27, 7:38 AM EDTMesoscale DiscussionSPCBeaufort, Berkeley, Charleston, Colleton, Dorchester, Hampton and 1 more2 hr
Sep 27, 10:27 AM EDTMesoscale DiscussionSPCAiken, Allendale, Bamberg, Barnwell, Beaufort, Berkeley and 25 more2 hr
Sep 27, 10:40 AM EDTTornado WatchSPCAiken, Allendale, Bamberg, Barnwell, Beaufort, Berkeley and 22 more6 hr

Nearby

Mesoscale Discussions in South Carolina, 2004Mesoscale Discussions in North Carolina, 2004Every mesoscale discussion in 2004

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.